The pace of rhyolite differentiation and storage in an 'archetypical' silicic magma system, Long Valley, California

Based on the largely distinct chemical and age characteristics of the zircon age populations, we conclude that the GM and BT rhyolites record episodes of punctuated and independent evolution rather than the periodic tapping of a long-lived magma chamber. Sr isotope characteristics of BT minerals previously used to support inheritance of those minerals from GM magmas can be explained by radiogenic ingrowth and by crystal growth from isotopically heterogeneous domains in the nascent BT magma chamber; evidence for the latter is provided by anomalously radiogenic feldspars.